document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=177481>Question 177481</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0131809520/algebrahomeworkh></A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Suppose you bought some 32c stamps and some 20c stamps.  You spent $3.92 for 16 stamps.  How many of each stamp did you buy? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #132520 by </B><A HREF=/tutors/aboutme.mpl?userid=solver91311><B>solver91311(24713)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=solver91311><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=solver91311><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=132520\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let x be the number of 32 cent stamps and y be the number of 20 cent stamps.  Then <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+%2B+y+=+16 ALIGN=MIDDLE  ALT=\"x+%2B+y+=+16\"   DISABLED_style= \"max-width:90%; height:auto;\" >.  The value of the 32 cent stamps  is 32x and the value of the 20 cent stamps is 20y, and the total value of the stamps is 392 cents, so:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=32x+%2B+20y+=+392 ALIGN=MIDDLE  ALT=\"32x+%2B+20y+=+392\"   DISABLED_style= \"max-width:90%; height:auto;\" >, but since we also know that <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+%2B+y+=+16 ALIGN=MIDDLE  ALT=\"x+%2B+y+=+16\"   DISABLED_style= \"max-width:90%; height:auto;\" > and we can then say <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+16+-+y ALIGN=MIDDLE  ALT=\"x+=+16+-+y\"   DISABLED_style= \"max-width:90%; height:auto;\" >, we can substitute for x in the value equation:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=32%2816+-+y%29+%2B+20y+=+392 ALIGN=MIDDLE  ALT=\"32%2816+-+y%29+%2B+20y+=+392\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Now all you need to do is solve the equation for y giving you the number of 20 cent stamps, and then subtract that value from 16 to get the number of 32 cent stamps. </SPAN>\n" );
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